Chemie Linz Gesellschaft M.b.h.

Dsm Chemie Linz Gmbh

Gerhard Stern

Martin Mullner

Erich Schulz

Markus Rossler

Kurt A Hackl

Heinrich Horacek

Gerhard Steinbauer

Heinz Falk

Martin M Ullner

Walter Kittl

Martin Muller

Jan Bartus

Otto Vogl

Markus R Ossler

2,6-dimethylphenylmaleimide is used as a comonomer for the preparation of styrene copolymers and vinyl chloride copolymers having an increased glass transition temperature and low intrinsic coloration compared with the prior art.

2,6-dimethylphenylmaleimide as a comonomer for styrene copolymers and

A process for the dissolution of chemical compounds by use of ureas in which at least one of the urea's two nitrogen atoms is part of a non-aromatic ring which can be broken by an oxygen or sulphur atom as a chemical solvent, and a method of producing tri- or tetraalkylated ureas or bis ureas wherein at least one of the urea's nitrogen atoms is part of a non-aromatic ring which can be broken by an oxygen or sulphur atom by means of dialkylating the --NH.sub.2 group of a urea with an alkene or alkene arylene alkene dihalogenide, disulphonate or dihydrogen sulphonate in the presence of a solid base and a phase-transfer catalyst.

Method for the production of N-cyclic and N,N'-dicyclic ureas and their

Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates or substituted isocyanates by reaction of an adduct of isocyanic acid and a tertiary amine with a primary and secondary amine, an alcohol, a thiol or a compound having one or two non-cumulated olefinic double bonds, and a process for the preparation of N-mono- or N,N-disubstituted ureas by reaction of ammonium isocyanates with a primary or secondary amine in a diluent.

Process for the preparation of asymmetrically substituted ureas,

A process for the preparation of isocyanic acid, characterized in that N,N-disubstituted ureas are decomposed at elevated temperature to a secondary amine of lower volatility and to isocyanic acid, which is drawn off at the top.

Process for the preparation of isocyanic acid by the decomposition of

Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates or substituted isocyanates by reaction of an adduct of isocyanic acid and a tertiary amine with a primary and secondary amine, an alcohol, a thiol or a compound having one or two non-cumulated olefinic double bonds, and a process for the preparation of N-mono- or N,N-disubstituted ureas by reaction of ammonium isocyanate with a primary or secondary amine in a diluent.

Process for the removal of isocyanic acid from a gaseous mixture of isocyanic acid and ammonia by introducing a tertiary amine or ether at 250.degree. to 600.degree. C. The gaseous reaction mixture is passed into an inert diluent and cooled, to condense an adduct of isocyanic acid and tertiary amine or ether, and the ammonia being removed as a gas.

Preparation of organic compounds using as a reactant an adduct of

Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates or substituted isocyanates by reaction of an adduct of isocyanic acid and a tertiary amine with a primary and secondary amine, an alcohol, a thiol or a compound having one or two non-cumulated olefinic double bonds.

Process for the preparation of substituted isocyanates

Process for the removal of isocyanic acid from a mixture of isocyanic

Process for the preparation of asymmetrically substituted ureas by reaction of a gaseous mixture of isocyanic acid and ammonia having a temperature of 260.degree. to 600.degree. C. with a primary or secondary amine.

Process for the preparation of asymmetrically substituted ureas

Process for selective removal and destruction of hydrogen cyanide contained in nitrous gases, in which the nitrous-containing gases are washed with nitric acid in counter-current in an absorption column and the nitric acid charged with hydrogen cyanide is regenerated at elevated temperature, with simultaneous hydrolysis and oxidation of the hydrogen cyanide.

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Sonnberg, Austria

Gerhard Stern